The April 25 episode will follow Klaus back to the supernatural melting pot that is the French Quarter of New Orleans - a town he helped build centuries ago - where he's reunited with his diabolical former protégé Marcel.

Should the episode prove successful, a spin-off of Diaries would be in consideration for next season that would be written and executive-produced by Julie Plec, alongside Alloy's Leslie Morgenstein and Gina Girolamo. Phoebe Tonkin, who plays werewolf Hayley on Diaries, would also star in the series.